Welding and brazing rod



April 5, 1932.

N. S. HARRINGTON WELDING AND BRAZING ROD Filed Oct 15, 1928 INVENTOR ATTORN EYQ Patented Apr. 5, 1932 UNIT NORMAN S. HARRINGTON, OF CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK WELDING AND BRAZING BOD Application filed October 15,1928. Serial No. 812,712.

The invention relates to composite metal rods for welding, brazing and other analogous purposes.

One of the objects of the invention is to provide a welding or brazing rod containing all the necessary ingredients for the formation of a metallic joint of the desired composition, said ingredients being present in such form as to be readily fused into a homogeneous alloy.

Another object is to provide a welding or brazing rod having both the alloy and the flux required for the welding or brazing operation in a self-contained form without requiring any extraneous binder.

A further object is to provide a welding or brazing rod having comminuted metals within a tubular container and having the flux also within the tubular container, the

flux being fused to unite the metallic particles to the container.

My invention contemplates the manufac-' ture of a composite rod for welding or brazing purposes in which there is an outer metallic'shell or sheath made of a metal or alloy adapted to enter into the composition and there are one or more comminuted metals or alloys arranged within the shell, said metals or alloys (sometimes designated as spelter) being present in such proportions as to form with the outer shell the desired composition when the rod is fused. Within the shell is also placed the amount of flux best suitable ,for the welding or brazing operation and in order to permanently retain the ingredients within the shell the composite rod is subj ectcd to a temperature sutiicient to fuse the flux 7 and thereby bind the spelter to the shell.

The process may be applied to composite rods adapted for various purposes by suitably choosing'the composition of the shell,

the spelter and the flux.

The rods may be used for Welding, brazing or soldering and may be applied to various metals and alloys such as carbon steel, high speed steel, nickel steel, vanadium steel, cast iron, aluminum and other alloys.

As an example of one embodiment of my invention, a brazing rod may be constructed adapted to deposit a fused alloy having a bronze composition containin copper, zinc and tin in substantially the ollowing proportions: a

Copper Zinc 38.

Till

Per cent' One method of constructing a brazing rod for the above purpose is to provide a thin brass tube or a sheet brasssliell of U- shaped cross section, the brass being of a composition readily obtainable in the sheet form and composition must'in any given case depend. upon the relative amounts of spelter and brass container and the composition of the spelter may be suitably varied to give the desired final composition when both alloys are fused together. The flux is mixed with the spelter in such proportions that when the rod is melted there will be just sufficient fluxing material to properly flux the spelter and the outer shell without addition of any other fluxing material during the brazing operation. Any suitable fluxing material may be used such, for example, as borax. After the mixture of flux and spelter is placed .within the outer shell, the brazing rod is then subjected to a temperature high enough to cause the flux to melt and surround the particles of spelter. Upon cooling the rod the flux solidifies into a glass-like composition, coating the particles of spelter and adhering to the walls of the shell thereby forming a binder and retaining the spelter and flux in permanent position within the shell.

The brazing rod, as above described, has many advantages, amongst which are that the speed of the brazing operation is greatly accelerated, the material is better fluxed, there is less flux deposit on the finished work and the joints are finer and more even. I 1

As a modified form of my invention, a brazing rod may be manufactured wherein the outer shell is made of the exact composition desired in the final de osited alloy. Thus, a

ferred method is to do so'by a continuous process, starting with a thin strip of the al- What I claim as my invention is:

A composite rod for welding, brazing and like purposes comprising an outer metallic wshell of brass containing from 60 to 66%% copper and to 33 zinc, comminuted metal containing approximately copper,

37% zinc and 3% tin within said shell, and a.

flux of borax fused into engagement with both said comminuted metal and said outer shell.

In testimony whereof I aflix my signature.

NORMAN S. HARRINGTON,

loy forming theouter container and subjecting the strip successively to a tube-forming process, a filling process and a heat treatment process. For a more complete description of this method, reference should be made to the accompanying drawings.

, Figure 1 is a diagrammatic view illustrating the manufacture of the brazing rod; Figure 2 is a cross section on the line 22 of Figure 1; 1 Figure 3 is a cross section on the line 33 of Figure 1; a Figure 4 is a cross section on the line 4-4 of Figure 1;

Figure 5 is across section of the finished product taken on the line 5-5 of Figure 1.

Referring now'to the-drawings, the letter A represents a flat strip which is 'fed continuously over suitable roller guides B andthrough a tube-forming device C, where the sides of the strip are bent upwardly to form the U-shaped'cross section illustrated in Figinto the U-shaped shell.

ure 3. D represents a hopper into which the mixture of flux and spelter is placed and fed E represents a tubular furnace through which the filled tube is drawn, the strip being designed to cause the flux to be fused while traveling through the same. F represents the finished brazing rod after it has emerged from the furnace and has been sufliciently cooled to cause the flux to solidify and adhere to the spelter and the side walls of the tube. a

It will be understood that while have'illustrated a preferred method of manufacturing the brazing rod, my invention is not necessarily limited to this method since othermethods might be used to obtain a composition coming within the purview of my invention. It is also to be understood that my'invention in its broader aspects may be applied to composite rods used not only for brazing purposes but also for welding and soldering, and may have combinations of ingredients such as to form alloy compositions suitable for various purposes. 

